Lock.



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AIiPLIGATION FILED DEO.28, 1911.

Patented June 4, 1912.

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LOOK.

VAPPLIGATION FILED DEO.28, 1911.

1,028,423; I Patent ed June 4, 1912.

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AUGUST AIR/ENS, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE AMERICAN HARDWARE CORPORATION, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

LOCK.

Specification of Letters Patent.

Application filed December 28, 1911.

Patented June 4, 1912.

Serial No. 668,292.

To all whom it may concern:

Be it known that I, AUGUsT Alums, a citizen of the United States, residing at New Britain, Hartford county, State of Connecticut, have invented certain new and useful Improvements in Locks, of which the following is a full, clear, and exact description.

My invention relates to an improvement in looks.

The object of the invention is to provide an improved locking device whereby a door may be so locked from the inside as to absolutely prevent access from the outside, either by the usual knob or the usual key, said auxiliary locking apparatus, however, being released automatically by the mere operating of the inside knob when the door is to be opened.

In the drawings, Figure 1 is a plan view of the main parts ofa lock constructed to embody my invention. Fig. 2 is a section on the line m-w, Fig. 1, looking in the direction of the arrows. Figs. 3 to 10 inclusive illustrate different detached details of construction.

1 is the frame of the lock.

2- is a bolt, in this instance a spring latch bolt.

3 is a yoke connected to the rear of the latch bolt and arranged to be operated by roll-backs. 1 is an inside knob operatively connected with a roll-back 5 which co -acts with said yoke 3 when said knob is turned. The usual spring 7 may be provided to project the latch.

8 is an outside knob operatively connected with a roll-back 9 for co-action with the yoke 3.

10 is a key controlled spindle operatively connected with a roll-back 11.

12 is a key in this instance arranged to be inserted in a cylinder look within the outside knob 8 and making a suitable connection with the roll-back 11 whereby the latch bolt may be withdrawn at certain times independently of either knob.

13 is a dogging slide arranged to block the rotation of the outside knob when in one position and release said knob when in another position. The end of this dead look ing slide in this particular instance is suitably guided in the hub of the frame 1 and takes into an opening 14 in the outer knob shank in line therewith. The operating means for this dead locking slide may comprise a tilting member 15 pivoted at the front of the lock frame adjacent to the latch bolt 2 and operating after the wellknown manner of a night latchso-called. Obviously, when the outer knob is dogged against being turned, access can be had from the outside only by means of a suitable key which operates the roll-back 11. If the occupant of a room desires absolute security, such as would be provided by an ordinary dead bolt operable from the inside of the room only, he may operate an auxiliary blocking device which is controlled by a knob or thumb-turn 16. This auxiliary blocking device comprises a dog 17 pivoted in one side of the frame 1, the forward end of which is designed to swing into position directly behind the latch bolt when the latter is extended so that it cannot be either pressed back or pulled back by any other means shown than the inside knob 4;. This blocking device 17 operates a slide or equivalent means 18 which in this instance is mounted for guidance upon the frame 1 and is connected to the hub of the blocking de vice 17 by a short arm 19, which extends into a notch in the slide whereby, as the blocking device is oscillated, the slide will be reciprocated. The rear end of the slide is provided with a yoke having two laterally extending arms 2020. Normally and when the blocking device 17 is not in operation or stands as shown in Fig. 2, these arms 2020 stand well in front of the rollback 5. When, however, the blocking device is turned to the latch blocking position wherein the nose thereof stands to the rear of the latch, the slide will be moved back and the arms 2020 will stand immediately in front of the two ends of the roll-back 5. It now follows that when this condition obtains, the slide 13 prevents the operation of the roll-back 9, and the key operated roll back 11 being of a shape that prevents it from engaging the lateral extensions 20 and yoke 3 simultaneously, it is therefore apparent that the latch bolt is absolutely blocked by device 17 and cannot be operated by the knob 8 or the key 12. If, however, the occupant of the room desires to go out,

it is unnecessary for him to first turn the thumb-turn 16 since the mere turning of the knob 4 causes one end of the roll-back 5 to engage with one of the lateral extensions 20 and push it forward, thereby operating the blocking device to throw it to its inoperative position, the other arm of said roll-back operating upon one end of the yoke 3 and thereby retracting the latch.

To avoid interference and jamming of the rear side of the latch against the front end or toe of the blocking device 17 during the retraction of the latch and the swinging of the blocking device, 1 preferably cut back or bevel the rear side of the latch bolt immediately in front of the toe of the blocking device 17, said bevel being indicated at 22, Fig. 7, so that as the toe swings up and the latch swings back, there will be a suflicient clearance at all times between the back of the latch bolt and the toe of the blocking device.

What I claim is:

1. In a lock, a latch, an lnner knob and roll-back for operating the latch, an outer knob and roll-back for operating the latch, a key-controlled device and roll-back for operating the latch, means for blocking the operation of the latch by the outer knob, independent means for blocking the latch against operation by the outer knob or said key, and means of connection between the inner knob and the last mentioned blocking means to release the latter when the inner knob is turned.

2. In a look, a latch, an inner knob and roll-back for operating the same, an outer knob and roll-back for operating the same, a key for operating the latch independently of the knobs, a dead locking device for the outer knob, a latch blocking device manually operable from the inside of the door to which the lock is applied when said door is closed, and operativelmeans of connection between the inner knob and the last mentioned latch blocking device to release the same when the inner knob is turned.

3. In a lock, a latch, an inner knob and roll-back for operating the same, an outer knob and roll-back for operating the same independently of the first mentioned knob, key controlled means concentric with said knobs for operating the latch independently of said knobs, a dogging device to prevent the operation of the latch by the outer knob, a latch blocking device to prevent the operation of the latch by the outer knob or the key, and means of connection between the blocking device and said inside knob to free said blocking device from the latch when the inside knob is turned.

AUGUST ARENS.

Witnesses G. A. SEELYE, H. E. SOHENY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

